fig4
Figure 4. Microscopic characterization of PtCo–S/MCS and PtCo/MCS. (A and B) TEM images with the inset showing the size distribution of metal clusters; and (C) HRTEM image; (D) HAADF-STEM image and the corresponding EDS elemental mappings of PtCo–S/MCS; (E and F) TEM images; and (G) HRTEM image; (H) HAADF-STEM image and the corresponding EDS elemental mappings of PtCo/MCS. HRTEM: High resolution transmission electron microscopy; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; MCS: mesoporous carbon nanospheres; EDS: energy-dispersive X-ray spectroscopy; TEM: transmission electron microscopy.



